<!DOCTYPE html>
<html lang="cn">
<head>
    <meta charset="UTF-8">
    <title>error</title>

    <style>
        body {
            margin: 0;
            padding: 0;
            background: radial-gradient(circle at 10% 20%, rgb(239, 246, 249) 0%, rgb(206, 239, 253) 90%);
        }

        .flex {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .not-found {
            font-size: 300px;
            color: #87CEEB;
        }
    </style>
</head>
<body>

<div class="flex">
    <div class="not-found">404</div>
</div>

</body>
</html>